40% of Hawaii's beaches could disappear by 2050, study predicts

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Could shrink by as much as 40% by 2050. Because of rising sea levels. That's according to researchers at the University of Hawaii. The team also looked at the impact of beach hardening the building of seawalls to unnaturally retains sand and maintained shorelines. Studies show they can actually accelerate erosion, Scientists warn. Almost 25 miles of beach on Oahu could one day disappear.

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